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  2. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  3. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    13-month calendars. Some calendar reformers seek to equalize the length of each month in the year. This is often accomplished by creating a calendar that has 13 months of 4 weeks (28 days) each, making 364 days. The earliest known proposal of this type was the Georgian Calendar (1745) [7] by Rev. Hugh Jones .

  4. Undecimber - Wikipedia

    en.wikipedia.org/wiki/Undecimber

    Undecimber is a name for the 13th month in a calendar that normally has ... added two months to the year 15 ... months in calendars extended beyond 13 months. For ...

  5. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The unattested but almost certain lunar year and the pre-Julian civil year were 354 or 355 days long, with the difference from the solar year more or less corrected by an irregular intercalary month. The Julian year was 365 days long, with a leap day doubled in length every fourth year, almost equivalent to the present Gregorian system .

  6. Zulu calendar - Wikipedia

    en.wikipedia.org/wiki/Zulu_calendar

    The Zulu calendar is the traditional lunisolar calendar used by the Zulu people of South Africa. [1] Its new year begins at the new moon of uMandulo (September) in the Gregorian calendar . The Zulu calendar is divided into two seasons, the summer iHlobo and Winter ubuSika. [2] The lunar seasonal calendar has 13 months [3] that do not correspond ...

  7. Hanke–Henry Permanent Calendar - Wikipedia

    en.wikipedia.org/wiki/Hanke–Henry_Permanent...

    Other proposals, like the Pax Calendar from 1930 and the International Fixed Calendar popularized by Cotsworth and Eastman, feature a perennial calendar with 13 months of 28 days each. The former also has a leap week whereas the latter has one day at the end of each year belonging to no month or week and another in leap years.